Anomalous dispersion of the acoustic mode in liquid Bi

M. Inui, Y. Kajihara, S. Munejiri, S. Hosokawa, A. Chiba, K. Ohara, S. Tsutsui, A. Q.R. Baron

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8 Citations (Scopus)

Abstract

Inelastic x-ray scattering measurements on liquid Bi were carried out. Prominent acoustic mode excitations were observed in the dynamic structure factor to beyond 12nm-1, which resolves previously conflicting results as to their presence beyond 6nm-1. We find the dispersion curve of the excitation energy with momentum transfer is nearly flat from 7 to 15nm-1 consistent with ab initio calculations of liquid Bi [J. Souto, Phys. Rev. B 81, 134201 (2010)PRBMDO1098-012110.1103/PhysRevB.81.134201]. Our ab initio and classical molecular dynamics simulations suggest that a long-range force is needed to reproduce the flatness of the dispersion curve, and the long-range force is correlated with a local structure consisting of shorter and longer bonds in the liquid.

Original languageEnglish
Article number054206
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number5
DOIs
Publication statusPublished - 2015 Aug 25

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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